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Issues of Frequency-to-Amplitude modulation (FM-to-AM) conversion occurred inphase-modulated third-harmonic generation (THG) process are investigated. Anexpression about group-velocity is theoretically derived to suppress theFM-to-AM conversion, which appears to be dependant on the ratio of modulationdepth of fundamental to second-harmonic when given the same modulationfrequencies of them. Simulation results indicate that the induced AM in THGprocess can be suppressed effectively when the expression about group-velocityis satisfied.

Suppression of FM-to-AM conversion in third-harmonic generation by tuning the ratio of modulation depth